Food Safety Center Guide
Cleaning vs Sanitizing: What Each One Means
Cleaning and sanitizing are two different jobs. Cleaning removes food, grease, residue and dirt from a surface. Sanitizing reduces microorganisms on a cleaned surface using an appropriate process or product. Cleaning generally happens before sanitizing: sanitizer cannot do its job through a layer of food residue.
The Core Food-Safety Principle
Freeze drying is not a sterilization step. If food is unsafe before freeze drying, freeze drying should not be expected to make it safe.
Freeze drying removes water; it does not reliably eliminate bacteria, viruses, molds, spores, or toxins. Low moisture can inhibit microbial growth during proper storage, but preventing growth is not the same as destroying microorganisms.
Cleaning First
Cleaning is the physical removal of soil: food debris, grease, starch, protein films and dust. It is done with a clean cloth or brush, warm water and an appropriate detergent or cleaning product, followed by rinsing where the product and surface require it. A surface cannot be relied upon as sanitized while visible soil is still on it.
Sanitizing After Cleaning
Sanitizing reduces microorganisms on an already-clean surface using an appropriate process or product. The right approach depends on the surface, the operation and local practice: heat, or a chemical sanitizer used according to its label. When you use a chemical sanitizer, follow the sanitizer manufacturer's labeled directions, including the correct concentration and contact time. Do not invent your own concentrations or dwell times.
Follow the Label
This site deliberately does not publish sanitizer concentrations or contact times. Sanitizer products differ, and the manufacturer's labeled directions are the correct source for how to use a specific product. Follow them exactly.
A Realistic Home-Scale Routine
For most home freeze-drying setups, a sensible rhythm is:
- Wash trays, utensils and containers with warm water and detergent after each batch.
- Rinse if required, then let everything air-dry or dry fully before storage.
- Sanitize food-contact surfaces appropriately before a batch when your routine calls for it, following the product's label.
- Keep the chamber, gasket area and drain clean and dry between batches. See Chamber Hygiene.
Frequently Asked Questions
What sanitizer concentration should I use?
Follow the sanitizer manufacturer's labeled directions for the specific product you have. This site does not publish concentrations because products differ.
Is sanitizing the same as sterilizing?
No. Sanitizing reduces microorganisms on a surface; it is not sterilization, and neither is freeze drying. The two are different concepts with different expectations.
Key Takeaways
- Cleaning removes food, grease, residue and dirt.
- Sanitizing reduces microorganisms on a cleaned surface.
- Clean before you sanitize; sanitizer cannot work through soil.
- Follow the sanitizer manufacturer's labeled directions; never invent concentrations.
Related Guides
Continue through the Food Safety Center with these related guides.